// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#include "io/fs/local_file_writer.h"

// IWYU pragma: no_include <bthread/errno.h>

#include <errno.h> // IWYU pragma: keep

#include <fcntl.h>

#include <glog/logging.h>

#include <sys/uio.h>

#include <unistd.h>

#include <algorithm>

#include <cstring>

#include <ostream>

#include <utility>

// IWYU pragma: no_include <opentelemetry/common/threadlocal.h>

#include "common/cast_set.h"

#include "common/compiler_util.h" // IWYU pragma: keep

#include "common/macros.h"

#include "common/metrics/doris_metrics.h"

#include "common/status.h"

#include "cpp/sync_point.h"

#include "io/fs/err_utils.h"

#include "io/fs/file_writer.h"

#include "io/fs/local_file_system.h"

#include "io/fs/path.h"

#include "storage/data_dir.h"

#include "util/debug_points.h"

namespace doris::io {

namespace {

Status sync_dir(const io::Path& dirname) {

    TEST_SYNC_POINT_RETURN_WITH_VALUE("sync_dir", Status::IOError(""));

    int fd;

    RETRY_ON_EINTR(fd, ::open(dirname.c_str(), O_DIRECTORY | O_RDONLY));

    if (-1 == fd) {

        return localfs_error(errno, fmt::format("failed to open {}", dirname.native()));

    }

    Defer defer {[fd] { ::close(fd); }};

#ifdef __APPLE__

    if (fcntl(fd, F_FULLFSYNC) < 0) {

        return localfs_error(errno, fmt::format("failed to sync {}", dirname.native()));

    }

#else

    if (0 != ::fdatasync(fd)) {

        return localfs_error(errno, fmt::format("failed to sync {}", dirname.native()));

    }

#endif

    return Status::OK();

}

} // namespace

LocalFileWriter::LocalFileWriter(Path path, int fd, bool sync_data)

        : _path(std::move(path)), _fd(fd), _sync_data(sync_data) {

    DorisMetrics::instance()->local_file_open_writing->increment(1);

    DorisMetrics::instance()->local_file_writer_total->increment(1);

}

size_t LocalFileWriter::bytes_appended() const {

    return _bytes_appended;

}

LocalFileWriter::~LocalFileWriter() {

    if (_state == State::OPENED) {

        _abort();

    }

    DorisMetrics::instance()->local_file_open_writing->increment(-1);

    DorisMetrics::instance()->file_created_total->increment(1);

    DorisMetrics::instance()->local_bytes_written_total->increment(_bytes_appended);

}

Status LocalFileWriter::close(bool non_block) {

    if (_state == State::CLOSED) {

        return Status::InternalError("LocalFileWriter already closed, file path {}",

                                     _path.native());

    }

    if (_state == State::ASYNC_CLOSING) {

        if (non_block) {

            return Status::InternalError("Don't submit async close multi times");

        }

        // Actucally the first time call to close(true) would return the value of _finalize, if it returned one

        // error status then the code would never call the second close(true)

        _state = State::CLOSED;

        return Status::OK();

    }

    if (non_block) {

        _state = State::ASYNC_CLOSING;

    } else {

        _state = State::CLOSED;

    }

    return _close(_sync_data);

}

void LocalFileWriter::_abort() {

    auto st = _close(false);

    if (!st.ok()) [[unlikely]] {

        LOG(WARNING) << "close file failed when abort file writer: " << st;

    }

    st = io::global_local_filesystem()->delete_file(_path);

    if (!st.ok()) [[unlikely]] {

        LOG(WARNING) << "delete file failed when abort file writer: " << st;

    }

}

Status LocalFileWriter::appendv(const Slice* data, size_t data_cnt) {

    TEST_SYNC_POINT_RETURN_WITH_VALUE("LocalFileWriter::appendv",

                                      Status::IOError("inject io error"));

    if (_state != State::OPENED) [[unlikely]] {

        return Status::InternalError("append to closed file: {}", _path.native());

    }

    _dirty = true;

    // Convert the results into the iovec vector to request

    // and calculate the total bytes requested.

    size_t bytes_req = 0;

    std::vector<iovec> iov(data_cnt);

    for (size_t i = 0; i < data_cnt; i++) {

        const Slice& result = data[i];

        bytes_req += result.size;

        iov[i] = {result.data, result.size};

    }

    size_t completed_iov = 0;

    size_t n_left = bytes_req;

    while (n_left > 0) {

        // Never request more than IOV_MAX in one request.

        size_t iov_count = std::min(data_cnt - completed_iov, static_cast<size_t>(IOV_MAX));

        ssize_t res;

        RETRY_ON_EINTR(res, SYNC_POINT_HOOK_RETURN_VALUE(::writev(_fd, iov.data() + completed_iov,

                                                                  cast_set<int32_t>(iov_count)),

                                                         "LocalFileWriter::writev", _fd));

        DBUG_EXECUTE_IF("LocalFileWriter::appendv.io_error", {

            auto sub_path = dp->param<std::string>("sub_path", "");

            if ((sub_path.empty() && _path.filename().compare(kTestFilePath)) ||

                (!sub_path.empty() && _path.native().find(sub_path) != std::string::npos)) {

                res = -1;

                errno = EIO;

                LOG(WARNING) << Status::IOError("debug write io error: {}", _path.native());

            }

        });

        if (UNLIKELY(res < 0)) {

            return localfs_error(errno, fmt::format("failed to write {}", _path.native()));

        }

        if (LIKELY(res == n_left)) {

            // All requested bytes were read. This is almost always the case.

            n_left = 0;

            break;

        }

        // Adjust iovec vector based on bytes read for the next request.

        ssize_t bytes_rem = res;

        for (size_t i = completed_iov; i < data_cnt; i++) {

            if (bytes_rem >= iov[i].iov_len) {

                // The full length of this iovec was written.

                completed_iov++;

                bytes_rem -= iov[i].iov_len;

            } else {

                // Partially wrote this result.

                // Adjust the iov_len and iov_base to write only the missing data.

                iov[i].iov_base = static_cast<uint8_t*>(iov[i].iov_base) + bytes_rem;

                iov[i].iov_len -= bytes_rem;

                break; // Don't need to adjust remaining iovec's.

            }

        }

        n_left -= res;

    }

    DCHECK_EQ(0, n_left);

    _bytes_appended += bytes_req;

    return Status::OK();

}

// TODO(ByteYue): Refactor this function as FileWriter::flush()

Status LocalFileWriter::_finalize() {

    TEST_SYNC_POINT_RETURN_WITH_VALUE("LocalFileWriter::finalize",

                                      Status::IOError("inject io error"));

    if (_state == State::OPENED) [[unlikely]] {

        return Status::InternalError("finalize closed file: {}", _path.native());

    }

    if (_dirty) {

#if defined(__linux__)

        int flags = SYNC_FILE_RANGE_WRITE;

        if (sync_file_range(_fd, 0, 0, flags) < 0) {

            return localfs_error(errno, fmt::format("failed to finalize {}", _path.native()));

        }

#endif

    }

    return Status::OK();

}

Status LocalFileWriter::_close(bool sync) {

    auto fd_reclaim_func = [&](Status st) {

        if (_fd > 0 && 0 != ::close(_fd)) {

            return localfs_error(errno, fmt::format("failed to {}, along with failed to close {}",

                                                    st, _path.native()));

        }

        _fd = -1;

        return st;

    };

    if (sync && config::sync_file_on_close) {

        if (_dirty) {

#ifdef __APPLE__

            if (fcntl(_fd, F_FULLFSYNC) < 0) [[unlikely]] {

                return fd_reclaim_func(

                        localfs_error(errno, fmt::format("failed to sync {}", _path.native())));

            }

#else

            if (0 != ::fdatasync(_fd)) [[unlikely]] {

                return fd_reclaim_func(

                        localfs_error(errno, fmt::format("failed to sync {}", _path.native())));

            }

#endif

            _dirty = false;

        }

        RETURN_IF_ERROR(fd_reclaim_func(sync_dir(_path.parent_path())));

    }

    DBUG_EXECUTE_IF("LocalFileWriter.close.failed", {

        // spare '.testfile' to make bad disk checker happy

        if (_path.filename().compare(kTestFilePath)) {

            return fd_reclaim_func(

                    Status::IOError("cannot close {}: {}", _path.native(), std::strerror(errno)));

        }

    });

    TEST_SYNC_POINT_RETURN_WITH_VALUE("LocalFileWriter::close", Status::IOError("inject io error"));

    return fd_reclaim_func(Status::OK());

}

} // namespace doris::io